Fed decision days often spark a major swing in the S&P 500 (SNPINDEX:^SPX), as interest rates play a big role in stock valuations. However, Wednesday's announcement, which held the Fed funds rate steady at 3. 75%-4%, didn't do much to move markets. The S&P 500 briefly jumped 30 points or 0. 4% when Fed Chair Kevin Warsh took the podium around 2:30 ET. By the end of his press conference, the index had given up those gains, though it moved modestly higher before the closing bell. Also notable about the decision was that it was not unanimous, unlike most Fed rate decisions.
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